lineSpacing.swift

extension UILabel {
  func setLineSpacing(lineSpacing: CGFloat) {
      let text = self.text
      if let text = text {
          let attributeString = NSMutableAttributedString(string: text)
          let style = NSMutableParagraphStyle()
          style.lineSpacing = lineSpacing
          style.alignment = self.textAlignment
          attributeString.addAttribute(NSAttributedString.Key.paragraphStyle, value: style, range: NSMakeRange(0, text.count))
          self.attributedText = attributeString
      }
  }
}